In which set below are all the elements in the same group?* A. B, C, N
B. N, O, F
C. Hg, Ga, Sr
D. Be, Ca, Ra

Which of these conditions most likely produces an unstable isotope?

Find the number of moles of argon in 364g of argon.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)